Thought you might be interested in my DIY repair stand. Used a saw bench I purchased from Supercheap Auto, 2 T brackets, threaded rod, 2 wing nuts, 2 washers, old wine cork (rubber), part of an old bottle cage and the case from an old computer powersupply filled with gravel to act as a counterweight to the rear wheel.
It needs painting and looks as rough as guts at the moment but it does a great job. Not bad for $20.
My DIY is a rope strung between rafters in the car port. I just hook the front corner of the seat/seat post on it. It sways a bit but it allows me to do all my derailleur adjustments.
I made a similar thing a while ago using an old QR hub mounted on a fence picket with a U-Clamp (like used for pipe or electrical conduit) and then drilled a couple of holes in the picket to mount it to the top of a folding aluminium stepladder using 2 x bolts and wingnuts.
The rear frame sits snugly on part of an old plastic bottle cage which is screwed into the end of the wooden beam. I thought of using a velcro strap to secure it but the bike is quite secure being held by the fork and ex bottle cage.